<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
 </head>
 <body >
  <div style="-moz-column-count: 12; border: 1px solid green">
   <span>AAAA
    <div style="float: left;border: 1px solid blue">BBBB
    </div>
   </span>
  </div>
 </body>
</html>
